Issue 35, 2021

Utilization of double-sensitized structure toward achieving high performance green and red phosphorescent organic light-emitting diodes

Abstract

In this work, iridium(III)bis(4-(tert-butyl)-2,6-diuoro-2,3-bipyridinne)acetylacetonate (FK306) was utilized as sensitizer and incorporated into both light-emitting and electron transport layers to constitute a double-sensitized system because of its low-lying energy levels and well matched triplet energy. Experimental results confirmed that the incorporated FK306 molecules were helpful in effectively modulating the transportation of electrons due to sensitizing effect, which caused decreased electron accumulation, improved carrier balance and thus enhanced carrier recombination probability. Furthermore, the presence of FK306 molecules within light-emitting and electron transport layers helped to broaden the recombination zone and suppress exciton quenching, thus leading to higher efficiency and slower efficiency roll-off. Finally, high performance green OLED with a double-sensitized structure obtained the maximum current efficiency of 95.86 cd A−1, external quantum efficiency of 28.6%, power efficiency of 94.06 lm W−1 and brightness of 102 924 cd m−2. And, our experimental results demonstrated that this device design strategy was also efficient in enhancing the performance of red OLEDs.

Graphical abstract: Utilization of double-sensitized structure toward achieving high performance green and red phosphorescent organic light-emitting diodes

Supplementary files

Article information

Article type
Paper
Submitted
15 jún 2021
Accepted
26 júl 2021
First published
26 júl 2021

J. Mater. Chem. C, 2021,9, 11729-11737

Utilization of double-sensitized structure toward achieving high performance green and red phosphorescent organic light-emitting diodes

S. Li, R. Wu, K. Chen, W. Sun, Z. Li and L. Zhou, J. Mater. Chem. C, 2021, 9, 11729 DOI: 10.1039/D1TC02756E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements